utils/glcanvas/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWindows and GTK
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     17/08/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 #include "glcanvas.h"
  17
  18 #include "wx/frame.h"
  19 #include "wx/colour.h"
  20 #include "wx/module.h"
  21 #include "wx/app.h"
  22
  23 extern "C" {
  24 #include "gtk/gtk.h"
  25 #include "gdk/gdk.h"
  26 #include "gdk/gdkx.h"
  27 }
  28
  29 #include "wx/gtk/win_gtk.h"
  30
  31 //---------------------------------------------------------------------------
  32 // global data
  33 //---------------------------------------------------------------------------
  34
  35 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  36
  37 //-----------------------------------------------------------------------------
  38 // idle system
  39 //-----------------------------------------------------------------------------
  40
  41 extern void wxapp_install_idle_handler();
  42 extern bool g_isIdle;
  43
  44 //---------------------------------------------------------------------------
  45 // wxGLContext
  46 //---------------------------------------------------------------------------
  47
  48 IMPLEMENT_CLASS(wxGLContext,wxObject)
  49
  50 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  51 {
  52     m_window = win;
  53     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  54
  55     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  56
  57     m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  58
  59     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  60 }
  61
  62 wxGLContext::wxGLContext(
  63                bool WXUNUSED(isRGB), wxWindow *win,
  64                const wxPalette& WXUNUSED(palette),
  65                const wxGLContext *other        /* for sharing display lists */
  66 )
  67 {
  68     m_window = win;
  69     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  70
  71     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  72
  73     if( other != 0 )
  74       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, other->m_glContext,
  75                                       GL_TRUE );
  76     else
  77       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  78
  79     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  80 }
  81
  82 wxGLContext::~wxGLContext()
  83 {
  84     if (!m_glContext) return;
  85
  86     if (m_glContext == glXGetCurrentContext())
  87     {
  88         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  89     }
  90
  91     glXDestroyContext( GDK_DISPLAY(), m_glContext );
  92 }
  93
  94 void wxGLContext::SwapBuffers()
  95 {
  96     if (m_glContext)
  97     {
  98         GdkWindow *window = GTK_MYFIXED(m_widget)->bin_window;
  99         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 100     }
 101 }
 102
 103 void wxGLContext::SetCurrent()
 104 {
 105     if (m_glContext)
 106     {
 107         GdkWindow *window = GTK_MYFIXED(m_widget)->bin_window;
 108         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 109     }
 110 }
 111
 112 void wxGLContext::SetColour(const char *colour)
 113 {
 114     float r = 0.0;
 115     float g = 0.0;
 116     float b = 0.0;
 117     wxColour *col = wxTheColourDatabase->FindColour(colour);
 118     if (col)
 119     {
 120         r = (float)(col->Red()/256.0);
 121         g = (float)(col->Green()/256.0);
 122         b = (float)(col->Blue()/256.0);
 123         glColor3f( r, g, b);
 124     }
 125 }
 126
 127 void wxGLContext::SetupPixelFormat()
 128 {
 129 }
 130
 131 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 132 {
 133 }
 134
 135 wxPalette wxGLContext::CreateDefaultPalette()
 136 {
 137     return wxNullPalette;
 138 }
 139
 140 //-----------------------------------------------------------------------------
 141 // "realize" from m_wxwindow
 142 //-----------------------------------------------------------------------------
 143
 144 static gint
 145 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 146 {
 147     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, win->m_sharedContext );
 148
 149     XFree( g_vi );
 150     g_vi = (XVisualInfo*) NULL;
 151
 152     return FALSE;
 153 }
 154
 155 //-----------------------------------------------------------------------------
 156 // "expose_event" of m_wxwindow
 157 //-----------------------------------------------------------------------------
 158
 159 static void
 160 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 161 {
 162     if (g_isIdle)
 163         wxapp_install_idle_handler();
 164
 165     win->m_exposed = TRUE;
 166
 167     win->GetUpdateRegion().Union( gdk_event->area.x,
 168                                   gdk_event->area.y,
 169                                   gdk_event->area.width,
 170                                   gdk_event->area.height );
 171 }
 172
 173 //-----------------------------------------------------------------------------
 174 // "draw" of m_wxwindow
 175 //-----------------------------------------------------------------------------
 176
 177 static void
 178 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 179 {
 180     if (g_isIdle)
 181         wxapp_install_idle_handler();
 182
 183     win->m_exposed = TRUE;
 184
 185     win->GetUpdateRegion().Union( rect->x, rect->y,
 186                                   rect->width, rect->height );
 187 }
 188
 189 //---------------------------------------------------------------------------
 190 // wxGlCanvas
 191 //---------------------------------------------------------------------------
 192
 193 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 194
 195 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 196     EVT_SIZE(wxGLCanvas::OnSize)
 197 END_EVENT_TABLE()
 198
 199 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 200                         const wxPoint& pos, const wxSize& size,
 201                         long style, const wxString& name,
 202                         int *attribList,
 203                         const wxPalette& palette )
 204 {
 205     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 206 }
 207
 208 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 209                         const wxGLContext *shared,
 210                         wxWindowID id,
 211                         const wxPoint& pos, const wxSize& size,
 212                         long style, const wxString& name,
 213                         int *attribList,
 214                         const wxPalette& palette )
 215 {
 216     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 217 }
 218
 219 bool wxGLCanvas::Create( wxWindow *parent,
 220                          const wxGLContext *shared,
 221                          wxWindowID id,
 222                          const wxPoint& pos, const wxSize& size,
 223                          long style, const wxString& name,
 224                          int *attribList,
 225                          const wxPalette& palette)
 226 {
 227     m_sharedContext = (wxGLContext*)shared;  // const_cast
 228
 229     m_exposed = FALSE;
 230     m_noExpose = TRUE;
 231
 232     if (!attribList)
 233     {
 234         int data[] = { GLX_RGBA,
 235                        GLX_DOUBLEBUFFER,
 236                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 237                        GLX_RED_SIZE, 1,
 238                        GLX_GREEN_SIZE, 1,
 239                        GLX_BLUE_SIZE, 1,
 240                        GLX_ALPHA_SIZE, 0,
 241                        None };
 242         attribList = (int*) data;
 243     }
 244     else
 245     {
 246       int data[512], arg=0, p=0;
 247
 248       while( (attribList[arg]!=0) && (p<512) )
 249       {
 250         switch( attribList[arg++] )
 251         {
 252           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 253           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 254           case WX_GL_DEPTH_SIZE:
 255             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 256           case WX_GL_MIN_RED:
 257             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 258           case WX_GL_MIN_GREEN:
 259             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 260           case WX_GL_MIN_BLUE:
 261             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 262           default:
 263             break;
 264         }
 265       }
 266       data[p] = 0;
 267
 268       attribList = (int*) data;
 269     }
 270
 271
 272     Display *dpy = GDK_DISPLAY();
 273
 274     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 275
 276     wxCHECK_MSG( g_vi, FALSE, "required visual couldn't be found" );
 277
 278     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 279     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 280
 281     gtk_widget_push_colormap( colormap );
 282     gtk_widget_push_visual( visual );
 283
 284     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 285
 286     m_glWidget = m_wxwindow;
 287
 288     gtk_my_fixed_set_clear( GTK_MYFIXED(m_wxwindow), FALSE );
 289
 290     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 291                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 292
 293     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 294         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 295
 296     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 297         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 298
 299     gtk_widget_pop_visual();
 300     gtk_widget_pop_colormap();
 301
 302     return TRUE;
 303 }
 304
 305 wxGLCanvas::~wxGLCanvas()
 306 {
 307     if (m_glContext) delete m_glContext;
 308 }
 309
 310 void wxGLCanvas::SwapBuffers()
 311 {
 312     if (m_glContext) m_glContext->SwapBuffers();
 313 }
 314
 315 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 316 {
 317     int width, height;
 318     GetClientSize( &width, &height );
 319
 320     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 321     {
 322         SetCurrent();
 323
 324         glViewport(0, 0, (GLint)width, (GLint)height );
 325         glMatrixMode(GL_PROJECTION);
 326         glLoadIdentity();
 327         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 328         glMatrixMode(GL_MODELVIEW);
 329     }
 330 }
 331
 332 void wxGLCanvas::SetCurrent()
 333 {
 334     if (m_glContext) m_glContext->SetCurrent();
 335 }
 336
 337 void wxGLCanvas::SetColour( const char *colour )
 338 {
 339     if (m_glContext) m_glContext->SetColour( colour );
 340 }
 341
 342 void wxGLCanvas::OnInternalIdle()
 343 {
 344     if (m_glContext && m_exposed)
 345     {
 346         wxPaintEvent event( GetId() );
 347         event.SetEventObject( this );
 348         GetEventHandler()->ProcessEvent( event );
 349
 350         m_exposed = FALSE;
 351         GetUpdateRegion().Clear();
 352     }
 353
 354     wxWindow::OnInternalIdle();
 355 }